function co() {
	alert(99);
	//$.fn.zTree.getZTreeObj("treeDemo").selectNode(this);
	//alert(this.setting.callback.onClick = alert("kkkk"));
	//alert(this.setting.data.simpleData.idKey);
	var id = $.fn.zTree.getZTreeObj("treeDemo").getSelectedNodes()[0].id;
	alert(id);
	return id;
}